Spectroscopy and lifetime measurements of ¹⁶⁶ ¹⁶⁸Os
2022:23 | 2023:60 | 2024:87 | 2025:6
Neutron-deficient osmium isotopes 166Os and 168Os have been studied with
γ-ray spectroscopy and lifetime measurements. The level scheme of 166Os has
been expanded with several new structures including second the 8+ and 10+
states. These states confirm the change in the structure of the yrast band
between the 6+ and 8+ states. Lifetimes of the low-lying excited states have
been measured in an RDDS measurement. The results reveal a sudden decrease
in the collectivity when moving towards the neutron shell closure. While the
2+ → 0+ transition is still collective in 168Os, in 166Os the reduced transition
probability is only few Weisskopf units, a value expected only at closed shells.
In 168Os the 4+ → 2+ transition is remarkably less collective than the 2+ → 0+
transition. While nuclear models predict a decrease in collectivity, no modern
calculations can explain the measured transition probabilities.
ISBN
978-951-39-7208-0ISSN Hae Julkaisufoorumista
0075-465XMetadata
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